As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN TEMP VERY WARM AT ROWS 6 TO 11. UNABLE TO COOL THAT AREA WITHOUT CAUSING REST OF FORWARD CABIN BECOMING COLD. ACFT GROUNDED. NO FAULTS LOGGED ON ZONE, FOUND FWD CABIN TEMP SENSOR FILTER CLOGGED, CLEANED. COND AIR TEMP UNIFORM THROUGHOUT CABIN, SYS OPS CKS NORMAL.